unregister_netdevice: waiting for vcan0 to become free. Usage count = 1201
ref_tracker: netdev@ffff88804cb60700 has 600/1200 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4557 [inline]
     j1939_ecu_create_locked+0x1fc/0x4d0 net/can/j1939/bus.c:159
     j1939_local_ecu_get+0x1b8/0x250 net/can/j1939/bus.c:293
     j1939_sk_bind+0x89b/0xdb0 net/can/j1939/socket.c:529
     __sys_bind_socket net/socket.c:1945 [inline]
     __sys_bind_socket net/socket.c:1937 [inline]
     __sys_bind+0x1a9/0x260 net/socket.c:1976
     __do_sys_bind net/socket.c:1981 [inline]
     __se_sys_bind net/socket.c:1979 [inline]
     __ia32_sys_bind+0x71/0xb0 net/socket.c:1979
     do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
     __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
     do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
     entry_SYSENTER_compat_after_hwframe+0x84/0x8e

ref_tracker: netdev@ffff88804cb60700 has 600/1200 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4528 [inline]
     netdev_hold include/linux/netdevice.h:4557 [inline]
     j1939_priv_create net/can/j1939/main.c:140 [inline]
     j1939_netdev_start+0x2b8/0x990 net/can/j1939/main.c:268
     j1939_sk_bind+0x479/0xdb0 net/can/j1939/socket.c:506
     __sys_bind_socket net/socket.c:1945 [inline]
     __sys_bind_socket net/socket.c:1937 [inline]
     __sys_bind+0x1a9/0x260 net/socket.c:1976
     __do_sys_bind net/socket.c:1981 [inline]
     __se_sys_bind net/socket.c:1979 [inline]
     __ia32_sys_bind+0x71/0xb0 net/socket.c:1979
     do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
     __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
     do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
     entry_SYSENTER_compat_after_hwframe+0x84/0x8e